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Area of a Circle (equation derived)
By Big Bang Physics
The equation for the area of a circle is derived with integration.
11.6 Areas of Circles, Sectors & Segments (Lesson)
By AutenMath
A lesson on finding the area of circles, sectors and segments
Formula for Area of a Circle
By Steven Ellis
This video shows that pi is equal to the ratio of the area of a circle to the area of a square when the radius of the circle equals the length of the side of the square. This is a view of pi other than the ratio of the circumference to the diameter.
Area of a Circle
By Khan Academy
u07_l2_t3_we3 Area of a Circle. All Khan Academy content is available for free at www.khanacademy.org
Area - Area Of A Circle
By mrmaisonet
Once you know what 'radius' and 'area' mean, watch this video to learn how to calculate the area of a circle. Pay attention to the common mistakes, such as using an incorrect order of operations.
Area of a circle
By Khan Academy
In this example, we solve for the area of a circle when given the diameter. If you recall, the diameter is the length of a line that runs across the circle and through the center.
Circles - Area, Circumference, Radius & Diameter Explained!
By The Organic Chemistry Tutor
This basic geometry video tutorial explains how to calculate the area and circumference of a circle given it's radius and diameter. This video contains a few examples with word problems. This video also explains how to calculate the circumference given the area, and how to calculate
CA Geometry: Circle area chords tangent | Worked examples | Geometry | Khan Academy
By Khan Academy
71-75, area, chords, tangents of circles. All Khan Academy content is available for free at www.khanacademy.org
10.1 The Circle (Lesson)
By AutenMath
A lesson on circle basics: circle definition, chords, diameter, radius, circumference, area of a circle, interior of a circle, exterior of a circle
Area of inscribed equilateral triangle (some basic trig used) | Circles | Geometry | Khan Academy
By Khan Academy
This video will give you a good feel for what inscribed figures are like. It uses some trigonometry to figure out what the area of an equilateral triangle inscribed in a circle is, given the circle's radius. NOTE: We don't actually need trigonometry to solve this problem. Notice that we can view the equilateral triangle as six identical 30-60-90 triangles, the hypotenuses of which are radii of the circle, then use the 30-60-90 triangle side length ratios to figure out the rest of what we need to know to solve the problem.
Area of inscribed equilateral triangle (some basic trig used) | Circles | Geometry | Khan Academy
By Khan Academy
This video will give you a good feel for what inscribed figures are like. It uses some trigonometry to figure out what the area of an equilateral triangle inscribed in a circle is, given the circle's radius. NOTE: We don't actually need trigonometry to solve this problem. Notice that we can view the equilateral triangle as six identical 30-60-90 triangles, the hypotenuses of which are radii of the circle, then use the 30-60-90 triangle side length ratios to figure out the rest of what we need to know to solve the problem.
Area of a circle
By Khan Academy
Learn how the number Pi allows us to relate the radius, diameter, and circumference of a circle.
Circle: Application: Finding Area and Length of a Race Track
By easymathk12
An oval track is made by erecting semicircles on each end of a 60m by 120m rectangle. Find the length of the track and the area enclosed by the track.
Labeling parts of a circle | Perimeter, area, and volume | Geometry | Khan Academy
By Khan Academy
Learn more: http://www.khanacademy.org/video?v=04N79tItPEA u07_l2_t3_we1 Parts of a Circle Content provided by TheNROCproject.org - (c) Monterey Institute for Technology and Education